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Title: Orbital Angular Momentum from Self‐Assembled Concentric Nanoparticle Rings

Abstract

Abstract Ring‐shaped nanostructures can focus, filter, and manipulate electromagnetic waves, but are challenging to incorporate into devices using standard nanofabrication techniques. Directed self‐assembly (DSA) of block copolymers (BCPs) on lithographically patterned templates has successfully been used to fabricate concentric rings and spirals as etching masks. However, this method is limited by BCP phase behavior and material selection. Here, a straightforward approach to generate ring‐shaped nanoparticle assemblies in thin films of supramolecular nanocomposites is demonstrated. DSA is used to guide the formation of concentric rings with radii spanning 150–1150 nm and ring widths spanning 30–60 nm. When plasmonic nanoparticles are used, ring nanodevice arrays can be fabricated in one step, and the completed devices produce high‐quality orbital angular momentum (OAM). Nanocomposite DSA simplifies and streamlines nanofabrication by producing metal structures without etching or deposition steps; it also introduces interparticle coupling as a new design axis. Detailed analysis of the nanoparticle ring assemblies confirms that the supramolecular system self‐regulates the spatial distribution of its components, and thus exhibits a degree of flexibility absent in DSA of BCPs alone, where structures are determined by polymer‐pattern incommensurability. The present studies also provide guidelines for developing self‐regulating DSA as an alternative to incommensurability‐driven methods.

Authors:
ORCiD logo [1];  [2];  [1];  [2];  [1];  [3]; ORCiD logo [4]
  1. Department of Materials Science and Engineering University of California at Berkeley Berkeley CA 94720 USA
  2. Department of Chemistry University of California at Berkeley Berkeley CA 94720 USA
  3. Department of Materials Science and Engineering University of California at Berkeley Berkeley CA 94720 USA, Materials Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  4. Department of Materials Science and Engineering University of California at Berkeley Berkeley CA 94720 USA, Department of Chemistry University of California at Berkeley Berkeley CA 94720 USA, Materials Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1821045
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Name: Advanced Materials Journal Volume: 33 Journal Issue: 40; Journal ID: ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Vargo, Emma, Evans, Katherine M., Wang, Qingjun, Sattler, Andrew, Qian, Yiwen, Yao, Jie, and Xu, Ting. Orbital Angular Momentum from Self‐Assembled Concentric Nanoparticle Rings. Germany: N. p., 2021. Web. doi:10.1002/adma.202103563.
Vargo, Emma, Evans, Katherine M., Wang, Qingjun, Sattler, Andrew, Qian, Yiwen, Yao, Jie, & Xu, Ting. Orbital Angular Momentum from Self‐Assembled Concentric Nanoparticle Rings. Germany. https://doi.org/10.1002/adma.202103563
Vargo, Emma, Evans, Katherine M., Wang, Qingjun, Sattler, Andrew, Qian, Yiwen, Yao, Jie, and Xu, Ting. Sat . "Orbital Angular Momentum from Self‐Assembled Concentric Nanoparticle Rings". Germany. https://doi.org/10.1002/adma.202103563.
@article{osti_1821045,
title = {Orbital Angular Momentum from Self‐Assembled Concentric Nanoparticle Rings},
author = {Vargo, Emma and Evans, Katherine M. and Wang, Qingjun and Sattler, Andrew and Qian, Yiwen and Yao, Jie and Xu, Ting},
abstractNote = {Abstract Ring‐shaped nanostructures can focus, filter, and manipulate electromagnetic waves, but are challenging to incorporate into devices using standard nanofabrication techniques. Directed self‐assembly (DSA) of block copolymers (BCPs) on lithographically patterned templates has successfully been used to fabricate concentric rings and spirals as etching masks. However, this method is limited by BCP phase behavior and material selection. Here, a straightforward approach to generate ring‐shaped nanoparticle assemblies in thin films of supramolecular nanocomposites is demonstrated. DSA is used to guide the formation of concentric rings with radii spanning 150–1150 nm and ring widths spanning 30–60 nm. When plasmonic nanoparticles are used, ring nanodevice arrays can be fabricated in one step, and the completed devices produce high‐quality orbital angular momentum (OAM). Nanocomposite DSA simplifies and streamlines nanofabrication by producing metal structures without etching or deposition steps; it also introduces interparticle coupling as a new design axis. Detailed analysis of the nanoparticle ring assemblies confirms that the supramolecular system self‐regulates the spatial distribution of its components, and thus exhibits a degree of flexibility absent in DSA of BCPs alone, where structures are determined by polymer‐pattern incommensurability. The present studies also provide guidelines for developing self‐regulating DSA as an alternative to incommensurability‐driven methods.},
doi = {10.1002/adma.202103563},
journal = {Advanced Materials},
number = 40,
volume = 33,
place = {Germany},
year = {Sat Aug 21 00:00:00 EDT 2021},
month = {Sat Aug 21 00:00:00 EDT 2021}
}

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